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| 型号： | LC5511D |
| 元件分类： | 稳压器 |
| 英文描述： | POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7 |
| 封装： | DIP-8/7 |
| 文件页数： | 27/40页 |
| 文件大小： | 888K |
| 代理商： | LC5511D |
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33
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
ROCP
IOCP
Compensation Current, I
ID
C2
Forward
voltage
Efw1
NP
NS
ND
D5
R1
S/GND
OCP
D/ST
C5
1(2)
3(5)
8(1)
R3
D7
C7
D6
C4
R4
DX1
DZX1
RX1
Flyback
voltage
Erev1
LC55xxD
(LC55xxF)
PS
D
EIN
Figure 47. OCP input compensation circuit
Figure 48. OCP input compensation
D/ST
VCC
S/GND
ROCP
R1
R3
C4
8(1)
2(4)
3(5)
1(2)
P
C2
C3
C5
LC55xxD
(LC55xxF)
OCP
L2
D5
D6
C7
D7
DX1
DZX1
RX1
R4
D
Figure 46. Input compensation OCP circuit
}
AC Input Voltage = 85 V
AC Input Voltage = 265 V
Time
Auxiliary
Winding
Forward
V
oltage
Efw1
0
DZX1
OCP input compensation
starting point: Efw1 ≈ DZX1
Efw2
Input Compensation Function for Overcurrent
Protection
The auxiliary winding forward voltage Efw1 is proportional to
the input voltage, EIN . Efw1 is applied to DZX1 , and RX1 and R3
translate the voltage Efw1 – Zener voltage of DZX1 , into the input
Compensation Current, I.
This input Compensation Current, I, creates the voltage of R3 × I,
and it lowers the compensated OCP threshold voltage to less than
the original OCP threshold voltage, VOCP = –0.6 V. This way,
when EIN is high, the compensation amount becomes high.
The DZX1 Zener diode is used to set the voltage at which the input
compensation begins, so choose the Zener voltage value that is
equal to Efw1 at the time when input compensation begins.
Optimize the circuit in a way to minimize the difference between
the overcurrent points at low and high AC input voltage. Also
ensure that the output current meets its target over the entire AC
input voltage range, as the normal curve shown in figure 45.
The OCP pin voltage, including surge voltage, must not exceed
its absolute maximum rating of –2.0 to 5.0 V at the highest AC
input voltage.
OCP Threshold Voltage with and without the
OCP Input Compensation Circuit
Without the input compensation circuit, as shown in the figure 48
upper panel, the overcurrent detecting voltage is equal to the sum
of the Overcurrent Protection Threshold Voltage, VOCP = 0.60 V,
and the voltage across R3 from the OCP pin sourcing current,
IOCP = – 40 μA.
=–
VROCP
|ROCP × IDP| = – |VOCP | + R3 × |IOCP |
(6)
In the converse situation, with the input compensation circuit, as
shown in the figure 48 lower panel, the overcurrent detecting volt-
age is equal to the sum of the Overcurrent Protection Threshold
Voltage, VOCP = 0.60 V, the voltage across R3 from the OCP pin
sourcing current, IOCP , and the voltage across R3 from the input
Compensation Current, I:
=–
V 'ROCP
|ROCP × I'DP| = – |VOCP | + |R3 × IOCP | – R3 × I
(7)
Determining OCP pin input compensation circuit component
values
Given:
EIN(PK) = C2 voltage
IDP = MOSFET drain peak current
VFX1 = DX1 forward voltage
DZX1 = DZX1 Zener voltage
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相关代理商/技术参数 |
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